>> there are 838 available spaces in the garage. >> it also knows when commercial spots are open to the public, and it refreshes every 8 seconds. >> however, if somebody snags that, in that 8 seconds, it will recalculate and take you to the nearest one after that. >> to see how good it really is, we decided to let an expert at finding parking spots use the app, the parking valet. >> i pick up a spot on pine street, about a block and a half from here, and we went around the block and there was a spot open. >> that easy? >> that easy. >> but it couldn't keep up with quick u-turns and sudden changes. it doesn't anticipate temporary construction zones either. but he said it's a work in progress and the first of its kind. in less than a month, 30,000 more spots will be available. in san francisco, allen wong, abc7 news. well, the app developer hopes to make it available in 50 cities by the end of the year.